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Popular Trigonometry >

45=57.7+arctan((3.5)/x)-arctan((175)/x)

Solution

4 5^{\circ} = 57. 7^{\circ} + arctan (\frac{3.5}{x}) - arctan (\frac{175}{x})

Solution

x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}, x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

Solution steps

4 5^{\circ} = 57. 7^{\circ} + arctan (\frac{3.5}{x}) - arctan (\frac{175}{x})

Switch sides

57. 7^{\circ} + arctan (\frac{3.5}{x}) - arctan (\frac{175}{x}) = 4 5^{\circ}

Rewrite using trig identities

57. 7^{\circ} + arctan (\frac{3.5}{x}) - arctan (\frac{175}{x})

Use the Sum to Product identity:

arctan (s) - arctan (t) = arctan (\frac{s - t}{1 + s t})

= 57. 7^{\circ} + arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}})

57. 7^{\circ} + arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) = 4 5^{\circ}

Move

57. 7^{\circ}

to the right side

57. 7^{\circ} + arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) = 4 5^{\circ}

Subtract

57. 7^{\circ}

from both sides

57. 7^{\circ} + arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) - 57. 7^{\circ} = 4 5^{\circ} - 57. 7^{\circ}

Simplify

57. 7^{\circ} + arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) - 57. 7^{\circ} = 4 5^{\circ} - 57. 7^{\circ}

Simplify

57. 7^{\circ} + arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) - 57. 7^{\circ} : arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}})

57. 7^{\circ} + arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) - 57. 7^{\circ}

Add similar elements:

57. 7^{\circ} - 57. 7^{\circ} = 0

= arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}})

Simplify

4 5^{\circ} - 57. 7^{\circ} : - 12. 7^{\circ}

4 5^{\circ} - 57. 7^{\circ}

Least Common Multiplier of

4, 1800 : 1800

4, 1800

Least Common Multiplier (LCM)

Prime factorization of

4 : 2 \cdot 2

4

4

divides by

24 = 2 \cdot 2

= 2 \cdot 2

Prime factorization of

1800 : 2 \cdot 2 \cdot 2 \cdot 3 \cdot 3 \cdot 5 \cdot 5

1800

1800

divides by

21800 = 900 \cdot 2

= 2 \cdot 900

900

divides by

2900 = 450 \cdot 2

= 2 \cdot 2 \cdot 450

450

divides by

2450 = 225 \cdot 2

= 2 \cdot 2 \cdot 2 \cdot 225

225

divides by

3225 = 75 \cdot 3

= 2 \cdot 2 \cdot 2 \cdot 3 \cdot 75

75

divides by

375 = 25 \cdot 3

= 2 \cdot 2 \cdot 2 \cdot 3 \cdot 3 \cdot 25

25

divides by

525 = 5 \cdot 5

= 2 \cdot 2 \cdot 2 \cdot 3 \cdot 3 \cdot 5 \cdot 5

2, 3, 5

are all prime numbers, therefore no further factorization is possible

= 2 \cdot 2 \cdot 2 \cdot 3 \cdot 3 \cdot 5 \cdot 5

Multiply each factor the greatest number of times it occurs in either

4

1800

= 2 \cdot 2 \cdot 2 \cdot 3 \cdot 3 \cdot 5 \cdot 5

Multiply the numbers:

2 \cdot 2 \cdot 2 \cdot 3 \cdot 3 \cdot 5 \cdot 5 = 1800

= 1800

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

1800

For

4 5^{\circ} :

multiply the denominator and numerator by

450

4 5^{\circ} = \frac{18 0 ^{\circ} 450}{4 \cdot 450} = 4 5^{\circ}

= 4 5^{\circ} - 57. 7^{\circ}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{18 0 ^{\circ} 450 - 10386 0 ^{\circ}}{1800}

Add similar elements:

8100 0^{\circ} - 10386 0^{\circ} = - 2286 0^{\circ}

= \frac{- 2286 0 ^{\circ}}{1800}

Apply the fraction rule:

\frac{- a}{b} = - \frac{a}{b}

= - 12. 7^{\circ}

arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) = - 12. 7^{\circ}

arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) = - 12. 7^{\circ}

arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) = - 12. 7^{\circ}

Apply trig inverse properties

arctan (\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}) = - 12. 7^{\circ}

arctan (x) = a \Rightarrow x = tan (a)

\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}} = tan (- 12. 7^{\circ})

tan (- 12. 7^{\circ}) = - tan (12. 7^{\circ})

tan (- 12. 7^{\circ})

Use the following property:

tan (- x) = - tan (x)

tan (- 12. 7^{\circ}) = - tan (12. 7^{\circ})

= - tan (12. 7^{\circ})

\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}} = - tan (12. 7^{\circ})

\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}} = - tan (12. 7^{\circ})

Solve

\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}} = - tan (12. 7^{\circ}) : x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}, x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}} = - tan (12. 7^{\circ})

Simplify

\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}} : - \frac{171.5 x}{x ^{2} + 612.5}

\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}

Combine the fractions

\frac{3.5}{x} - \frac{175}{x} : - \frac{171.5}{x}

Apply rule

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{3.5 - 175}{x}

Subtract the numbers:

3.5 - 175 = - 171.5

= \frac{- 171.5}{x}

Apply the fraction rule:

\frac{- a}{b} = - \frac{a}{b}

= - \frac{171.5}{x}

= \frac{- \frac{171.5}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}

Apply the fraction rule:

\frac{- a}{b} = - \frac{a}{b}

= - \frac{\frac{171.5}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

\frac{\frac{171.5}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}} = \frac{171.5}{x ( 1 + \frac{3.5}{x} \cdot \frac{175}{x} )}

= - \frac{171.5}{x ( 1 + \frac{3.5}{x} \cdot \frac{175}{x} )}

\frac{3.5}{x} \cdot \frac{175}{x} = \frac{612.5}{x ^{2}}

\frac{3.5}{x} \cdot \frac{175}{x}

Multiply fractions:

\frac{a}{b} \cdot \frac{c}{d} = \frac{a \cdot c}{b \cdot d}

= \frac{3.5 \cdot 175}{xx}

Multiply the numbers:

3.5 \cdot 175 = 612.5

= \frac{612.5}{xx}

xx = x^{2}

xx

Apply exponent rule:

a^{b} \cdot a^{c} = a^{b + c}

xx = x^{1 + 1}

= x^{1 + 1}

Add the numbers:

1 + 1 = 2

= x^{2}

= \frac{612.5}{x ^{2}}

= - \frac{171.5}{x ( \frac{612.5}{x ^{2}} + 1 )}

Join

1 + \frac{612.5}{x ^{2}} : \frac{x ^{2} + 612.5}{x ^{2}}

1 + \frac{612.5}{x ^{2}}

Convert element to fraction:

1 = \frac{1 x ^{2}}{x ^{2}}

= \frac{1 \cdot x ^{2}}{x ^{2}} + \frac{612.5}{x ^{2}}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{1 \cdot x ^{2} + 612.5}{x ^{2}}

Multiply:

1 \cdot x^{2} = x^{2}

= \frac{x ^{2} + 612.5}{x ^{2}}

= - \frac{171.5}{\frac{x ^{2} + 612.5}{x ^{2}} x}

Multiply

x \frac{x ^{2} + 612.5}{x ^{2}} : \frac{x ^{2} + 612.5}{x}

x \frac{x ^{2} + 612.5}{x ^{2}}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( x ^{2} + 612.5 ) x}{x ^{2}}

Cancel the common factor:

x

= \frac{x ^{2} + 612.5}{x}

= - \frac{171.5}{\frac{x ^{2} + 612.5}{x}}

Apply the fraction rule:

\frac{a}{\frac{b}{c}} = \frac{a \cdot c}{b}

= - \frac{171.5 x}{x ^{2} + 612.5}

- \frac{171.5 x}{x ^{2} + 612.5} = - tan (12. 7^{\circ})

Multiply both sides by

x^{2} + 612.5

- \frac{171.5 x}{x ^{2} + 612.5} = - tan (12. 7^{\circ})

Multiply both sides by

x^{2} + 612.5

- \frac{171.5 x}{x ^{2} + 612.5} (x^{2} + 612.5) = - tan (12. 7^{\circ}) (x^{2} + 612.5)

Simplify

- 171.5 x = - tan (12. 7^{\circ}) (x^{2} + 612.5)

- 171.5 x = - tan (12. 7^{\circ}) (x^{2} + 612.5)

Solve

- 171.5 x = - tan (12. 7^{\circ}) (x^{2} + 612.5) : x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}, x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

- 171.5 x = - tan (12. 7^{\circ}) (x^{2} + 612.5)

Expand

- tan (12. 7^{\circ}) (x^{2} + 612.5) : - tan (12. 7^{\circ}) x^{2} - 612.5 tan (12. 7^{\circ})

- tan (12. 7^{\circ}) (x^{2} + 612.5)

Apply the distributive law:

a (b + c) = ab + a c

a = - tan (12. 7^{\circ}), b = x^{2}, c = 612.5

= - tan (12. 7^{\circ}) x^{2} + (- tan (12. 7^{\circ})) \cdot 612.5

Apply minus-plus rules

+ (- a) = - a

= - tan (12. 7^{\circ}) x^{2} - 612.5 tan (12. 7^{\circ})

- 171.5 x = - tan (12. 7^{\circ}) x^{2} - 612.5 tan (12. 7^{\circ})

Switch sides

- tan (12. 7^{\circ}) x^{2} - 612.5 tan (12. 7^{\circ}) = - 171.5 x

Move

171.5 x

to the left side

- tan (12. 7^{\circ}) x^{2} - 612.5 tan (12. 7^{\circ}) = - 171.5 x

Add

171.5 x

to both sides

- tan (12. 7^{\circ}) x^{2} - 612.5 tan (12. 7^{\circ}) + 171.5 x = - 171.5 x + 171.5 x

Simplify

- tan (12. 7^{\circ}) x^{2} - 612.5 tan (12. 7^{\circ}) + 171.5 x = 0

- tan (12. 7^{\circ}) x^{2} - 612.5 tan (12. 7^{\circ}) + 171.5 x = 0

Write in the standard form

a x^{2} + b x + c = 0

- 0.22535 \dots x^{2} + 171.5 x - 138.03283 \dots = 0

Solve with the quadratic formula

- 0.22535 \dots x^{2} + 171.5 x - 138.03283 \dots = 0

Quadratic Equation Formula:

For

a = - 0.22535 \dots, b = 171.5, c = - 138.03283 \dots

x_{1, 2} = \frac{- 171.5 \pm 171. 5 ^{2} - 4 ( - 0.22535 \dots ) ( - 138.03283 \dots )}{2 ( - 0.22535 \dots )}

x_{1, 2} = \frac{- 171.5 \pm 171. 5 ^{2} - 4 ( - 0.22535 \dots ) ( - 138.03283 \dots )}{2 ( - 0.22535 \dots )}

171. 5^{2} - 4 (- 0.22535 \dots) (- 138.03283 \dots) = 29287.82182 \dots

171. 5^{2} - 4 (- 0.22535 \dots) (- 138.03283 \dots)

Apply rule

- (- a) = a

= 171. 5^{2} - 4 \cdot 0.22535 \dots \cdot 138.03283 \dots

Multiply the numbers:

4 \cdot 0.22535 \dots \cdot 138.03283 \dots = 124.42817 \dots

= 171. 5^{2} - 124.42817 \dots

171. 5^{2} = 29412.25

= 29412.25 - 124.42817 \dots

Subtract the numbers:

29412.25 - 124.42817 \dots = 29287.82182 \dots

= 29287.82182 \dots

x_{1, 2} = \frac{- 171.5 \pm 29287.82182 \dots}{2 ( - 0.22535 \dots )}

Separate the solutions

x_{1} = \frac{- 171.5 + 29287.82182 \dots}{2 ( - 0.22535 \dots )}, x_{2} = \frac{- 171.5 - 29287.82182 \dots}{2 ( - 0.22535 \dots )}

x = \frac{- 171.5 + 29287.82182 \dots}{2 ( - 0.22535 \dots )} : \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}

\frac{- 171.5 + 29287.82182 \dots}{2 ( - 0.22535 \dots )}

Remove parentheses:

(- a) = - a

= \frac{- 171.5 + 29287.82182 \dots}{- 2 \cdot 0.22535 \dots}

Multiply the numbers:

2 \cdot 0.22535 \dots = 0.45071 \dots

= \frac{- 171.5 + 29287.82182 \dots}{- 0.45071 \dots}

Apply the fraction rule:

\frac{- a}{- b} = \frac{a}{b}

- 171.5 + 29287.82182 \dots = - (171.5 - 29287.82182 \dots)

= \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}

x = \frac{- 171.5 - 29287.82182 \dots}{2 ( - 0.22535 \dots )} : \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

\frac{- 171.5 - 29287.82182 \dots}{2 ( - 0.22535 \dots )}

Remove parentheses:

(- a) = - a

= \frac{- 171.5 - 29287.82182 \dots}{- 2 \cdot 0.22535 \dots}

Multiply the numbers:

2 \cdot 0.22535 \dots = 0.45071 \dots

= \frac{- 171.5 - 29287.82182 \dots}{- 0.45071 \dots}

Apply the fraction rule:

\frac{- a}{- b} = \frac{a}{b}

- 171.5 - 29287.82182 \dots = - (171.5 + 29287.82182 \dots)

= \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

The solutions to the quadratic equation are:

x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}, x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}, x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

Verify Solutions

Find undefined (singularity) points:

x = 0

Take the denominator(s) of

\frac{\frac{3.5}{x} - \frac{175}{x}}{1 + \frac{3.5}{x} \cdot \frac{175}{x}}

and compare to zero

x = 0

The following points are undefined

x = 0

Combine undefined points with solutions:

x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}, x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}, x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

Verify solutions by plugging them into the original equation

Check the solutions by plugging them into

57. 7^{\circ} + arctan (\frac{3.5}{x}) - arctan (\frac{175}{x}) = 4 5^{\circ}

Remove the ones that don't agree with the equation.

Check the solution

\frac{171.5 - 29287.82182 \dots}{0.45071 \dots} :

True

\frac{171.5 - 29287.82182 \dots}{0.45071 \dots}

Plug in

n = 1

\frac{171.5 - 29287.82182 \dots}{0.45071 \dots}

For

57. 7^{\circ} + arctan (\frac{3.5}{x}) - arctan (\frac{175}{x}) = 4 5^{\circ}

plug in

x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}

57. 7^{\circ} + arctan (\frac{3.5}{\frac{171.5 - 29287.82182 \dots}{0.45071 \dots}}) - arctan (\frac{175}{\frac{171.5 - 29287.82182 \dots}{0.45071 \dots}}) = 4 5^{\circ}

Refine

0.78539 \dots = 0.78539 \dots

\Rightarrow True

Check the solution

\frac{171.5 + 29287.82182 \dots}{0.45071 \dots} :

True

\frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

Plug in

n = 1

\frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

For

57. 7^{\circ} + arctan (\frac{3.5}{x}) - arctan (\frac{175}{x}) = 4 5^{\circ}

plug in

x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

57. 7^{\circ} + arctan (\frac{3.5}{\frac{171.5 + 29287.82182 \dots}{0.45071 \dots}}) - arctan (\frac{175}{\frac{171.5 + 29287.82182 \dots}{0.45071 \dots}}) = 4 5^{\circ}

Refine

0.78539 \dots = 0.78539 \dots

\Rightarrow True

x = \frac{171.5 - 29287.82182 \dots}{0.45071 \dots}, x = \frac{171.5 + 29287.82182 \dots}{0.45071 \dots}

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